Replacement coil looks like series 190
Thank you for reaching out to us. We don't have this kind of weight rating for the Series 190, I'm afraid. However, if the window sash is 25 pounds, you can use two S190-640 6-pound springs on each side of the window. This totals 24 pounds of overall support, which should be fine for the window sash since the weights are within a pound of the actual sash weight. Note that you would also need the 15-181 to accommodate the double spring setup.
Please let us know if you have any questions!
Regards,
Patrick
Take a look at the photo below as an example. The coil springs attach to the sides of the shoe with screws. For new bushings, see the 15-182. If you need additional screws, you can take the old ones to a local hardware store for them to match up.

No problem! You will be provided with delivery estimates during checkout. All "Express Delivery" orders are shipped out the next business day. Regular shipping orders take approximately 2-3 business days to be processed and shipped out!
No problem at all, I'm happy to help! I'll be here if you need anything else!